Real time dynamic monitoring of three-axis accelerometer M-A352AD

May 27,2024
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How can earthquake monitoring equipment quickly detect the occurrence of seismic waves? How to quickly transmit seismic signals to the system or equipment and enable people to quickly make corresponding countermeasures? How to maintain stable and reliable monitoring in harsh environments? One of its core technologies is the use of sensor technology and related equipment. We can deploy small sensors on a large scale in earthquake prone areas or key observation areas, and integrate them into the earthquake monitoring system with the digital technology of the Internet of Things. This can achieve long-term continuous monitoring of relevant areas without the need for manual maintenance. But in practical applications, there will still be many problems. For example, if the measurement frequency of a single device is not wide enough, multiple devices need to be combined to cover all the frequency ranges that need to be measured, the monitoring accuracy is insufficient, and it cannot adapt well to harsh outdoor environments.

To address these issues, The high-precision three-axis accelerometer M-A352AD, continuously optimized and upgraded by EPSON for the earthquake monitoring industry, can play a good role. This product has been successfully applied in intensity meters certified by the Japan Meteorological Agency. Let's take a look at how EPSON's latest high-precision three-axis accelerometer M-A352AD can effectively monitor earthquakes.

Due to the influence of different media, seismic waves have different frequencies, and their distribution ranges from DC to 400Hz. This means that in order to comprehensively monitor, it is necessary to cover the entire frequency band. Of course, it is feasible to independently monitor different frequency bands through multiple monitoring units. However, many times, due to limitations in the deployment environment, it is not possible to deploy multiple monitoring units simultaneously, which leads to users needing to choose the measurement frequency range and unable to comprehensively monitor all vibration situations. Therefore, how to achieve full frequency seismic monitoring through a single sensor is a difficult problem that needs to be solved.

The high-precision three-axis accelerometer M-A352AD utilizes digital sensor technology and a built-in programmable digital filter to accurately filter out signals in the desired frequency range, eliminating the need for multiple monitoring units in different frequency ranges. It can achieve full frequency range monitoring from DC to 460Hz, truly achieving deployment and comprehensive monitoring under any environmental conditions with a single sensor, thus solving the problem of users needing to choose a frequency range.

At the same time, the high-precision three-axis accelerometer M-A352AD has an output range of+15g, which can output at any time even when facing peak accelerations of magnitude 10 earthquakes (about 1g). And its anti-interference performance is also impressive, with an average noise density performance as low as 0.2uGNHz. If calculated at a frequency of 6Hz, it is only less than 1uG of noise value, which has almost negligible impact on the measurement results, greatly improving measurement accuracy and ensuring more comprehensive accurate monitoring of all vibrations.

Due to the need for continuous and long-term measurements in earthquake monitoring, high reliability is one of its important considerations. But because the existing traditional monitoring units contain many mechanical structural parts, once the equipment is directly impacted at the epicenter, it will often be damaged. Not only did it bring economic losses, but it also failed to provide support for subsequent aftershocks and rapid source localization.

EPSON adopts QMEMS technology design, which makes the high-precision three-axis accelerometer M-A352AD have extremely tight internal design and no vulnerable mechanical units, giving it a shock resistance of up to 1000G. Compared with the previous generation product's 300G, the parameters have been significantly improved. Even when facing longitudinal waves with a speed of up to 7 kilometers per second, the instantaneous acceleration force of over 700 G generated will not be damaged, which can better cope with the reliability problem of long-term outdoor deployment monitoring.